I think the WEGO simultaneous turns system (Frozen Synapse, Laser Squad Nemesis, Combat Mission), is a viable alternative to turn-based or real-time with pause combat that ought to be explored more by developers. This style of combat can resolve in only a few turns but still requires highly tactical planning, a bit of luck, and a bit of instinct. I think it's a great system that doesn't get enough love. If designed well and integrated in to the game with fluidity, this sort of combat would be a blast to use in a fantasy RPG or a more modern setting. Imagine a WEGO system incorporated into the tight combat situations of Temple of Elemental Evil. Don't get me wrong, that combat system was DEEP, but it was also very drawn out.

Then when the WEGO combat is all over, you play the whole thing back in real time and watch everything just flow so naturally.